Finding the Fourth Proportional to 11,807.10, 16,218.50 and 11,748.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,807.10 : 16,218.50 = 11,748.78 : x
2. Step 2: Convert to fraction form
   11,807.10/16,218.50 = 11,748.78/x
3. Step 3: Cross multiply
   11,807.10x = 16,218.50 × 11,748.78
4. Step 4: Simplify right side
   11,807.10x = 190,547,529.69
5. Step 5: Solve for x
   x = 190,547,529.69/11,807.10
6. Step 6: Final answer
   x = 16,138.39